package com.utils;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class JdbcUtils {

    private static DruidDataSource dataSource;

    static {
        try {
            Properties properties=new Properties();
            //读取druid.properties属性配置文件
            InputStream inputStream=JdbcUtils.class.getClassLoader().getResourceAsStream("druid.properties");
            //从流中加载数据
            properties.load(inputStream);
            //创建数据库连接池
            dataSource= (DruidDataSource)DruidDataSourceFactory.createDataSource(properties);
            //测试
            //System.out.println(dataSource.getConnection());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //获取数据库连接池中的连接
    //返回null则失败；有值即成功
    public static Connection getConnection(){
        Connection conn=null;
        try {
            conn=dataSource.getConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return  conn;
    }
    //关闭连接，放回数据库连接池
    public static  void close(Connection conn){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
